Air-pump.



H. 0. JOHNSON.

AIR PUMP.

APPLICATION msn Ausw, 19u. 1 ,275,440 Patented Aug. 13, 1918.

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UNITED STATES HARRY O. JOHNSON, OF CALI-IAN, COLORADO.

AIR-PUMP.

Specification of Letters Patent.

Application filed August 8, 1917. Serial No. 185,146.

To all whom t may concern:

Be it known that I, HARRY O. JOHNSON, a citizen of the United States, residing at Callian, in the county of El Paso and State of Colorado, have invented certain new and useful Improvements in Air- Pumps, of which the following is a specication.

This invention relates to new and useful improvements in air pumps for use in pumping air into automobile and like tires,` and the principal object of the invention is to provide a pump which will pump air on both the up stroke and the down stroke and in which the cylinders are independent of each other.

Another object of the invention is to provide a conduit leading from each of the compression ends of the cylinders for receiving the air therefrom and means connected with said conduits for leading the air therefrom.

A further object of the invention is to place the outlet tubes connected with the conduits, between the cylinders so that the tubes will be out of the way and protected from blo-ws and knocks, by the cylinders.

A still further object of the invention is to make the cylinders of the same size and independent of each other so that if one should get out of order the other will still work.

Another object of the invention is to provide a device of this character, which is simple and durable in construction, reliable and `efficient in operation and one which can be manufactured and placed upon the market at a minimum cost.

The invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim.

In describing my invention in detail, reference will be had to the accompanying drawings, wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a longitudinal sectional view through my improved pump. V

Fig. 2 is a section on line 2 2 of Fig. 1, and

Fig. 3 is a section on line 3 3 of Fig. 1.

In these gures, 1 represents the base of the pump, 2 and 3 the cylinders thereof while 4 represents the cover plate. The

base and cover plates are provided with circular recesses to receive the ends` of the cylinders and said cylinders are riveted in these parts, as shown. 5 represents the handle of the pump which is connected with the pair of rods 6 to which the suction members 7 are connected.

These members are arranged to work on opposite strokes, as heretofore, and the cylinder 3 is provided with an air inlet 8 at its upper end while the cylinder 2 is provided with an air inlet 9 at its lower end. 10 represents a packing box on the cover plate for the rod 6 that enters the cylinder 2. As will be seen the two cylinders are of the same size and are not connected with each other. The base 1 is provided with a conduit 11 which leads from the bottom of cylinder 3 to the central part of the upper face of the base. 12 represents a conduit in the cover plate communicating with the upper end of the cylinder 2 and passing through the lower face of said plate at the center thereof. 13 represents a pipe located vbetween the cylinders and having its lower end inserted in the conduit 11 while 14 represents a similar pipe having its upper end inserted in the conduit 12 and its lower end connectedfwith the upper end of the pipe Patented Aug. 13, 1918. Y

ends of the couplings together and provided with a nipple to receive the flexible tube 18 which is adapted to carry the air from the pump to the tire. The base 1 is provided with t-he foot receiving portions 19, as is usual.

In operating the pump on the up-stroke the air is forced from the cylinder 2 through the conduit 12 and pipe 14, by the valve 16 and into the tire by way of the tube 18. On

the down-stroke the air is forced from the cylinder 3 through the conduit 11 and pipe 13, by the valve 16 into the tire by way of tube 18. Thus it will be seen that the cylinders are independent of each other and if one should get out of order the pump will still work on the one cylinder. Furthermore the pipes and valves are protected by the cylinders and these parts are so located as to be out of the way and to permit the pump to be readily placed in the tool boX.

While I have shown the parts as being riveted together it will, of course, be understood that such rivets may be replaced by 'ff-base plate and opening into the lower end screws so as to facilitate the taking apart of the members composing the pump.

It is thought from the foregoing that the advantages and novel features of my invention will be readily apparent.

I desire it to be understood that I may make slight changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

An air pump comprising a pair of cylinders disposed in parallel relation, a base plate to which one end of each of said cylinders is attached, a cover plate for the opposite ends of said cylinders, a piston in each of said cylinders, a conduit formed in the of one of said cylinders, a conduit in the cover plate opening` into the top of the other cylinder, a pipe. connected to each of said conduits disposed in alinement between theY cylinders and parallel thereto, a Valve casing,` connected to the opposed ends of said pipes, non-return valves in said valve casing, a flexible tube also connected to said valve casing, and manual means for reciprocating` said pistons.

In testimony whereof I afliX my signature 30 in presence of two witnesses.

HARRY O. JOHNSON.

1Witnesses:

E. G. FREZIE, C. A. GORE.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner lo' Patents, Washington, ZD. C. 

